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alunogen

[uh-loo-nuh-juh n]
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noun
  1. a mineral, hydrous sulfate of aluminum, Al2(SO4)3⋅18H2O, occurring as a white, fibrous crust on quarry or mine walls.
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Origin of alunogen

1865–70; < French alun (see alunite) + -o- + -gen
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018